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ssa: implement #[collapse_debuginfo]

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Debuginfo line information for macro invocations are collapsed by
default - line information are replaced by the line of the outermost
expansion site. Using `-Zdebug-macros` disables this behaviour.

When the `collapse_debuginfo` feature is enabled, the default behaviour
is reversed so that debuginfo is not collapsed by default. In addition,
the `#[collapse_debuginfo]` attribute is available and can be applied to
macro definitions which will then have their line information collapsed.

Signed-off-by: David Wood <david.wood@huawei.com>
This commit is contained in:
David Wood 2022-07-21 16:19:22 +01:00
parent 2991a7c715
commit 38958aa8bd
20 changed files with 699 additions and 35 deletions
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6
compiler/rustc_feature/src/builtin_attrs.rs
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@ -481,6 +481,12 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
experimental!(deprecated_safe),
),
// `#[collapse_debuginfo]`
gated!(
collapse_debuginfo, Normal, template!(Word), WarnFollowing,
experimental!(collapse_debuginfo)
),
// ==========================================================================
// Internal attributes: Stability, deprecation, and unsafe:
// ==========================================================================